Is there a way to batch raw sql?

[Lao-Ax]

I have set of model objects, which I would prepareDestroyPermanently.
Each object has @children documents. I'm not sure that iterating though them to prepareDestory for each is a nice idea.
So, I want to add into a batch a simple sql to delete such rows (btw I didn't find prepareDestroyAll).

So, is there a way to put into a batch a raw sql query?